Anti-drawing test device

Abstract

The utility model relates to the technical field of pull-out tests, and provides a pull-out test device which comprises an equipment support, a center hole jack, a first hollow sleeve, an extension unit and a second hollow sleeve, the equipment support is arranged on the outer side of a soil layer, and a test sample is arranged in the middle of the equipment support; the center hole jack is fixed in the middle of the equipment bracket; the first hollow sleeve fixes a test sample through a first connecting structure, and the first connecting structure is used for clamping the test sample; the extension unit is used for being connected with the first hollow sleeve, an extension rod is arranged at the end, away from the first hollow sleeve, of the extension unit, and the end of the extension rod sequentially penetrates through the equipment support and the center hole jack. A second hollow sleeve is fixed to the end of the extension bar through a second connecting structure, the second connecting structure is used for clamping the extension bar, and the anti-pull test device can be used under the condition that the exposed steel strand of a test sample is insufficient in length, is convenient to mount and dismount, and can meet the anti-pull test requirements in various engineering practices.

Description

Technical Field

[0001] This utility model relates to the field of pull-out testing technology, and more specifically, to a pull-out testing device. Background Technology

[0002] Pull-out testing is a test method used to evaluate the bearing capacity and deformation characteristics of pile foundations under vertical pull-out forces. It is mainly used to determine the ultimate vertical pull-out bearing capacity of a single pile to ensure the safety and reliability of the pile foundation in actual engineering projects. Generally, the following conditions must be met for pull-out testing of test samples: after construction, the exposed steel strands (reinforcing bars) of the test sample must have sufficient length to pass through the jack for locking. Typically, pull-out tests are conducted on samples with an exposed length of not less than 50 cm.

[0003] In actual testing, pull-out tests cannot be performed directly when the exposed length of the test sample is less than 50cm. Utility Model Content

[0004] The purpose of this invention is to address the problems in the prior art by providing a pull-out test device that can fix the exposed steel strands of the test sample when the length of the exposed steel strands is insufficient, thus facilitating pull-out tests.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] This utility model provides a pull-out test device, comprising: an equipment support, a through-hole jack, a first hollow sleeve, an extension unit, and a second hollow sleeve, wherein:

[0007] The equipment support is set on the outside of the soil layer, and the end of the test sample extends out of the soil layer and penetrates into the equipment support;

[0008] The through-hole jack is fixed on the equipment support, and the output end of the through-hole jack faces away from the test sample;

[0009] The first hollow sleeve is disposed in the equipment bracket and the test sample is fixed by the first connecting structure;

[0010] The extension unit is located in the equipment bracket. One end of the extension unit is used to connect to the first hollow sleeve, and the other end of the extension unit is provided with an extension rod. The end of the extension rod passes through the equipment bracket and the through-hole jack in sequence.

[0011] The second hollow sleeve is installed at the output end of the through-hole jack and connected to the end of the extension rod through the second connecting structure.

[0012] Optionally, one end of the extension unit is provided with a cavity along the axial direction, the inner surface of the cavity is provided with an internal thread, the outer surface of the first hollow sleeve is provided with an external thread, and the first hollow sleeve is disposed in the cavity and threadedly connected to the cavity.

[0013] Optionally, the first connecting structure and the second connecting structure each include a plurality of arc-shaped metal sheets distributed in a circle. The inner side of the metal sheets is provided with threads to thread-connect the extension rod and the test sample, respectively. The outer diameter of the metal sheets gradually decreases towards the side closer to the soil layer. The inner diameter of the first hollow sleeve and the second hollow sleeve are respectively fitted with the outer diameter of the corresponding metal sheet.

[0014] Optionally, the extension rod and extension unit can be integrated into one unit.

[0015] Optionally, a pad is provided between the second hollow sleeve and the through jack, and the extension rod passes through the pad.

[0016] Optionally, the outer surface of the extension rod is provided with scale lines.

[0017] This utility model provides a pull-out testing device, comprising: an equipment support, a through-hole jack, a first hollow sleeve, an extension unit, and a second hollow sleeve. The equipment support is positioned outside the soil layer, with the end of the test sample extending out of the soil and penetrating the equipment support. The through-hole jack is fixed to the equipment support, with its output end facing away from the test sample. The first hollow sleeve is located within the equipment support and secures the test sample via a first connecting structure. The extension unit is located within the equipment support; one end of the extension unit connects to the first hollow sleeve, and the other end is equipped with an extension rod, the end of which passes sequentially through the equipment support and the through-hole jack. The second hollow sleeve is installed at the output end of the through-hole jack and connected to the end of the extension rod via a second connecting structure. This pull-out testing device can be used when the exposed steel strand length of the test sample is insufficient, is easy to install and disassemble, and can meet various pull-out testing needs in practical engineering applications. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a pull-out test device provided in an embodiment of this application;

[0020] Figure 2This is a schematic diagram of the inner structure of the first connection structure provided in an embodiment of this application;

[0021] Figure 3 This is a top view of the first connection structure provided in an embodiment of this application.

[0022] Icons: 1. Soil layer; 2. Test sample; 3. Equipment support; 41. First hollow sleeve; 42. Second hollow sleeve; 5. First connecting structure; 51. Metal sheet; 7. Extension rod; 6. Extension unit; 9. Pad; 10. Second connecting structure; 8. Through-hole jack. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. It should be noted that, without conflict, the various features in the embodiments of this application can be combined with each other, and the combined embodiments are still within the protection scope of this application.

[0024] In pull-out tests, the following conditions must typically be met for the test specimen: after construction, the exposed steel strands of the test specimen must have sufficient length to pass through the jack and be locked in place. Generally, samples with an exposed length of not less than 50 cm are selected for pull-out tests. In actual testing, pull-out tests cannot be performed directly when the exposed length of the test specimen is less than 50 cm. To solve the above problem, this application provides a pull-out testing device that can fix the exposed steel strands of the test specimen when the exposed length is insufficient, facilitating pull-out testing.

[0025] like Figure 1As shown, this application provides a pull-out test device, including an equipment support 3, a through-hole jack 8, a first hollow sleeve 41, an extension unit 6, and a second hollow sleeve 42. The equipment support 3 is located outside the soil layer 1, and the end of the test sample 2 extends out of the soil layer 1 and passes through the equipment support 3. The through-hole jack 8 is fixed to the equipment support 3, with its output end facing away from the test sample 2. The first hollow sleeve 41 is located in the equipment support 3 and is fixed to the test sample 2 via a first connecting structure 5. The extension unit 6 is located in the equipment support 3, with one end connected to the first hollow sleeve 41 and the other end of the extension unit 6 having an extension rod 7. The end of the extension rod 7 passes through the equipment support 3 and the through-hole jack 8 in sequence. The second hollow sleeve 42 is installed at the output end of the through-hole jack 8 and connected to the end of the extension rod 7 via a second connecting structure 10. This device can be used when the exposed steel strand length of test sample 2 is insufficient, which solves the problem that pull-out tests cannot be performed due to insufficient exposed length in the prior art, and expands the applicability of the pull-out test device.

[0026] Specifically, one end of the extension unit 6 is provided with a cavity along the axial direction, the inner surface of the cavity is provided with an internal thread, the outer surface of the first hollow sleeve 41 is provided with an external thread, the first hollow sleeve 41 is disposed in the cavity and is threadedly connected to the cavity.

[0027] For example, such as Figure 2 and Figure 3 As shown, Figure 2 This is a schematic diagram of the inner structure of the first connecting structure 5. Figure 3 This is a top view of the first connecting structure 5. The first connecting structure 5 and the second connecting structure 10 each include several circumferentially distributed arc-shaped metal sheets 51. The inner side of each metal sheet 51 is threaded to connect the extension rod 7 and the test sample 2. The outer diameter of the metal sheet 51 gradually decreases towards the side closest to the soil layer 1. The inner diameters of the first hollow sleeve 41 and the second hollow sleeve 42 respectively fit the outer diameter of the corresponding metal sheet 51. This facilitates the fixing and connection of the test sample 2, improves operational convenience, enhances connection reliability, and facilitates installation and disassembly.

[0028] Specifically, the extension rod 7 and the extension unit 6 are integrated into one unit.

[0029] Specifically, a pad 9 is provided between the second hollow sleeve 42 and the through jack 8, and the extension rod 7 is set through the pad 9, which makes the whole device more stable during the test and reduces the safety hazards caused by the instability of the device.

[0030] Specifically, the outer surface of the extension rod 7 is provided with scale lines, which facilitates accurate measurement and control of the displacement of the test sample 2 during the test, thereby improving the accuracy and reliability of the test.

[0031] The working process of the pull-out testing device provided in this application embodiment is as follows: During the pull-out test, the equipment support 3 is tightly attached to the surface of the soil layer 1. The exposed part of the test sample 2 is fixed in the first hollow sleeve 42 through the first connecting structure 5. The first connecting structure 5 includes three circumferentially distributed arc-shaped metal plates 51. The corresponding three metal plates 51 are threadedly connected to the test sample 2. When the through-hole jack 8 applies force, the metal plates 51 will respectively lock the test sample 2 and the extension rod 7. The first hollow sleeve 41 and the extension unit 6 are threadedly connected. The extension rod passes through the equipment support 3 and the through-hole jack 8 in sequence, and is fixed on the other side of the through-hole jack 8 through the second connecting structure 10 and the second hollow sleeve 42. A pad 9 is provided between the second hollow sleeve 42 and the through-hole jack. After the test starts, the elongation of the test sample 2 can be determined by observing the displacement of the second hollow sleeve 42, thereby completing the pull-out test of the test sample 2.

[0032] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pull-out test apparatus, characterized in that, Includes equipment support (3), through-hole jack (8), first hollow sleeve (41), extension unit (6), and second hollow sleeve (42), wherein: The equipment support (3) is set outside the soil layer (1), and the end of the test sample (2) extends out of the soil layer (1) and penetrates into the equipment support (3); The through-hole jack (8) is fixed on the equipment bracket (3), and the output end of the through-hole jack (8) faces away from the test sample (2); The first hollow sleeve (41) is disposed in the equipment bracket (3) and the test sample (2) is fixed by the first connecting structure (5); The extension unit (6) is located in the equipment bracket (3). One end of the extension unit (6) is used to connect the first hollow sleeve (41). The other end of the extension unit (6) is provided with an extension rod (7). The end of the extension rod (7) passes through the equipment bracket (3) and the through-hole jack (8) in sequence. The second hollow sleeve (42) is installed at the output end of the through-hole jack (8) and connected to the end of the extension rod (7) through the second connecting structure (10).

2. The pull-out test apparatus according to claim 1, characterized in that, One end of the extension unit (6) is provided with a cavity along the axial direction. The inner surface of the cavity is provided with an internal thread, and the outer surface of the first hollow sleeve (41) is provided with an external thread. The first hollow sleeve (41) is disposed in the cavity and is threadedly connected to the cavity.

3. The pull-out test apparatus according to claim 1, characterized in that, The first connecting structure (5) and the second connecting structure (10) each include a plurality of arc-shaped metal sheets (51) arranged in a circular pattern. The inner side of the metal sheet (51) is provided with threads to connect the extension rod (7) and the test sample (2) respectively. The outer diameter of the metal sheet (51) gradually decreases towards the side closer to the soil layer (1). The inner diameter of the first hollow sleeve (41) and the second hollow sleeve (42) respectively fits the outer diameter of the corresponding metal sheet (51).

4. The pull-out test apparatus according to claim 1, characterized in that, The extension rod (7) and the extension unit (6) are integrally formed.

5. The pull-out test apparatus according to claim 1, characterized in that, A pad (9) is provided between the second hollow sleeve (42) and the through jack (8), and the extension rod (7) is provided through the pad (9).

6. The pull-out test apparatus according to claim 1, characterized in that, The outer surface of the extension rod (7) is provided with scale lines.

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